This photograph taken from the Internation Space Station shows the shallow sand bars to the west (left side) of Eleuthera Island in the Bahamas.
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The water there is only a few feet deep.
To the east (right side) the seep water is a pure blue-no subsurface features are visible.
The spectacular underwater formations to the west of Eleuthera Island are made of calcium carbonate sand that has been eroded off of coral reefs and deposited in dunes by ocean currents.
This 2002 image was captured by astronauts aboard the International Space Station.
Located in the middle of the Bahamas, Eleuthra Island is 110 miles long, and in places just over a mile wide.
Around 8,000 people live there.